Actually, a malapropism is the substitution of a word that sounds similar, but not identical, to the intended word (such as when Archie on "All in the Family" referred to the "Women's Lubrication Movement", rather than "Liberation").

In Strahan's example, "bored" and "board" are words that sound identical but are spelled differently. These are called homonyms.

As far as I know, Strahan's example would simply be called a misspelling. I don't know of any term that specifically means substituting a homonym. In a case like this, it's irrelevant that "board" also happens to be a word, as its meaning is obviously unrelated to the text.

Actually, a malapropism is the substitution of a word that sounds similar, but not identical, to the intended word (such as when Archie on "All in the Family" referred to the "Women's Lubrication Movement", rather than "Liberation").

In Strahan's example, "bored" and "board" are words that sound identical but are spelled differently. These are called homophones.

As far as I know, Strahan's example would simply be called a misspelling. I don't know of any term that specifically means substituting a homonym. In a case like this, it's irrelevant that "board" also happens to be a word, as its meaning is obviously unrelated to the text.